Welcome!
I’m going to +1 @manofdogz, the YabDab plug-in is a great way to pull in your blog, especially if you have a ton of content. You can use it with the free version of WP. My only suggestion is to change your WP privacy settings after you publish your new RW site to make sure Google doesn’t index the WP site.
I’d also agree that, were I in your shoes, I’d build whatever other pages you have on your site using Stacks. It’s the cornerstone of our community. There is a stack for pretty much any functionality that you could want on your site.
There is a learning curve with RW, but tons of helpful people here in the forums. Once you’ve mastered the basics, you’ll be amazed at how much you can do!
For themes, I’d send you to @nickcates over at Nick Cates Design. I’ve used his themes for over 6 years and they are awesome to work with.
Best of luck!